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Old March 6, 2013, 08:16 PM   #5
Senior Member
Join Date: April 18, 2011
Posts: 494
Just my experience, but for every inch of barrel past 4", expect to see about 35 fps more velocity from the 9mm.

Of course, I also had a G19 (4") that'd shoot Fed 147 gr. HydraShoks 75 fps faster than my G17 (4.5"), but that just goes to show that there are no guarantees that a longer barrel will shoot faster than a shorter one.
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